Alloy Geek 840 High Alloy Austenitic Stainless Steel Standard
Alloy 840, also known as Incoloy 840 or UNS S33400, is a high-alloy austenitic stainless steel with specific properties that make it suitable for applications in high-temperature environments, particularly for furnace components and other heat-resistant applications. It's worth noting that Alloy 840 is not as widely recognized or commonly used as some other stainless steel alloys.
The composition of Alloy 840 typically includes:
- Chromium (about 19-22%)
- Nickel (about 32-35%)
- Iron (about 39-42%)
- Small amounts of other elements like manganese, silicon, carbon, and sulfur
Key features and characteristics of Alloy 840:
High-Temperature Strength: Alloy 840 offers good high-temperature strength and resistance to oxidation, making it suitable for applications that involve exposure to elevated temperatures.
Thermal Expansion: The alloy has a relatively low coefficient of thermal expansion, which is beneficial for applications that require dimensional stability at high temperatures.
Applications: Alloy 840 is used in applications like heat treatment furnace components, radiant tubes, and other heat-resistant equipment for high-temperature processes.
Oxidation Resistance: The alloy's composition provides it with resistance to oxidation at elevated temperatures, which helps maintain its mechanical properties over time.
Forms: Alloy 840 is available in various forms, including sheets, plates, bars, tubes, and pipes.
Machinability: Alloy 840 can be machined, but its high strength and resistance to deformation at high temperatures can make machining challenging.
Heat Treatment: Alloy 840 can be annealed to improve its ductility and machinability.
Keep in mind that Alloy 840 might not be as widely used as other stainless steel alloys, and information about it might be less readily available. If you're considering using Alloy 840 for a specific project, consulting with materials experts or manufacturers who specialize in heat-resistant alloys is recommended to ensure it meets your desired performance requirements, especially in terms of high-temperature stability and suitability for your intended application.
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In summary, the main difference between a reference material and a certified reference material lies in the level of characterization, validation, and certification. CRMs have undergone a more comprehensive and rigorous testing process, resulting in certified values and uncertainties that can be confidently used for instrument calibration, quality control, and research. Reference materials, on the other hand, can provide a point of comparison but do not have the same level of certification and traceability as CRMs. When accuracy and traceability are critical, certified reference materials are preferred.